Alireza Pourkhabbaz; Najme Boosaeidi; Moslem Jahani
Volume 11, Issue 4 , January 2014
Abstract
It is now well recognized that heavy metals in the environment cause pollution that can be harmful to living organisms. Without control, heavy metals that are transferred to the environment may undergo significant changes and have a serious impact on aquatic environments, public health and economics. ...
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It is now well recognized that heavy metals in the environment cause pollution that can be harmful to living organisms. Without control, heavy metals that are transferred to the environment may undergo significant changes and have a serious impact on aquatic environments, public health and economics. In view of the serious detrimental effect to the environment and health of wastewater containing Cr (VI), there is an urgent need for regulation. The objective of the present study was to investigate Cr (VI) removal from aqueous solutions using barberry leaves. The effects of parameters such as acidity, contact time, sorbent dose and initial concentration were evaluated for batch mode. Results showed maximum adsorption in an acidic medium at pH level 2; initial Cr(VI) concentration of 80 mg L−1 and temperature of 25◦C with a contact time of 10 min at 200 rpm stirring speed. Test results were analysed by adsorption isotherms and kinetics modelling and the best adaptation was made by the Langmuir isotherm and the second best by the para-stage synthetic model.
Tahereh Khazaei; Alireza Pourkhabbaz
Volume 10, Issue 2 , January 2013
Abstract
Sediments are as a sink of various pollutants, especially heavy metals in aquatic ecosystems; that is, they are the potential source of toxic chemicals. The purpose of this investigation is the study of pollution intensity and source of heavy metals in sediments from Anzali Wetland. Sediment samples ...
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Sediments are as a sink of various pollutants, especially heavy metals in aquatic ecosystems; that is, they are the potential source of toxic chemicals. The purpose of this investigation is the study of pollution intensity and source of heavy metals in sediments from Anzali Wetland. Sediment samples were selected from six sites in Anzali wetland in summer 2009. The determination of sediments contamination by heavy metals was performed using a sequential extraction process in four stages. The results showed that levels of cadmium and copper were higher in comparison with the values of the Earth’s crust and of global sediments. In all the stations, the levels for the individual concentration factor for Cd and Cu was more than one. So these elements can be a danger for the health of the wetland because of high bioavailability. The ICF value for the studied metals in the six stations was following: Pb< Cd< Cu In fact, it should be noted that the release of heavy metals from sediments are inthe strong acidic conditions while stations, sediment have a neutral pH.
